A ratchet pusher used to adjust the interval of frames when attaching side frames to the outer plating and the inner bottom plating of a ship.
When operating the handle, the length of the NPR-A ratchet pusher gets longer as the pipe comes out by the functioning of the screw. NPR-A is an efficient ratchet pusher which is lighter and easier to be transported and simpler to operate than the existing HYD'JACK. The stopper type has the built-in pin to prevent the screw from completely coming out of a pipe.
How to use
After fixing the ratchet pusher between a tack welded frame(L- and T-section steel) and a frame to be tack welded, push up or down the pawl according to purposes and then operate the handle.
Do not exceed the rated capacity specified on the ratchet pusher. Be careful that the pusher can slip when the erected angle of the inner plating and the frame is more or less than 90° For non-stopper types, leave at least 40mm of the screw thread inside one end of the pipe(80mm for both ends) when pulling the screw out of a pipe.